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Related Experiment Video

Updated: Feb 9, 2026

Use of the Pyrimidine Analog, 5-Iodo-2′-Deoxyuridine IdU with Cell Cycle Markers to Establish Cell Cycle Phases in a Mass Cytometry Platform
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Attempted suicide and the lunar cycle.

V M Mathew1, J Lindesay, N Shanmuganathan

  • 1United Medical and Dental School (Guy's Campus), United Kingdom.

Psychological Reports
|June 1, 1991
PubMed
Summary

This study found no link between the lunar cycle, including the full moon, and attempted suicide cases. Researchers analyzed 383 emergency department visits over one year, finding no correlation.

Area of Science:

  • Psychiatry
  • Public Health
  • Sociology

Background:

  • Anecdotal evidence and popular belief suggest a correlation between lunar cycles and human behavior, including mental health crises.
  • Previous studies on the lunar effect have yielded conflicting results, necessitating further investigation.

Purpose of the Study:

  • To investigate the potential association between the lunar cycle and the incidence of attempted suicide.
  • To determine if specific lunar phases, particularly the full moon, are linked to increased suicide attempts.

Main Methods:

  • A retrospective analysis of 383 cases of attempted suicide presenting to an Accident and Emergency Department.
  • Data collection spanned 12 complete lunar cycles (one year).
  • No specific control for confounding factors such as weekends or holidays was implemented.

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Main Results:

  • The analysis of 383 attempted suicide cases revealed no statistically significant association with the lunar cycle.
  • The incidence of attempted suicide did not notably increase during the full moon phase.
  • The study's limitations include the lack of control for potential confounding variables.

Conclusions:

  • The findings do not support a link between the lunar cycle and attempted suicide.
  • Further research with controlled variables may be warranted to definitively rule out any subtle lunar influences.